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533 lines
18 KiB
C++
533 lines
18 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 2001 Netscape Communications Corporation.
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* All Rights Reserved.
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*
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* Contributor(s):
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* Chris Saari <saari@netscape.com>
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*/
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#include "prmem.h"
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#include "nsGIFDecoder2.h"
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#include "nsIInputStream.h"
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#include "nsIComponentManager.h"
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#include "nsMemory.h"
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#include "imgIContainerObserver.h"
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#include "imgILoad.h"
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#include "nsRect.h"
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//////////////////////////////////////////////////////////////////////
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// GIF Decoder Implementation
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// This is an adaptor between GIF2 and imgIDecoder
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NS_IMPL_ISUPPORTS1(nsGIFDecoder2, imgIDecoder);
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nsGIFDecoder2::nsGIFDecoder2()
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: mCurrentRow(-1)
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, mLastFlushedRow(-1)
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, mGIFStruct(nsnull)
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, mAlphaLine(nsnull)
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, mRGBLine(nsnull)
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, mBackgroundRGBIndex(0)
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, mCurrentPass(0)
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, mLastFlushedPass(0)
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, mGIFOpen(PR_FALSE)
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{
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}
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nsGIFDecoder2::~nsGIFDecoder2(void)
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{
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if (mAlphaLine)
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nsMemory::Free(mAlphaLine);
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if (mRGBLine)
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nsMemory::Free(mRGBLine);
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if (mGIFStruct) {
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gif_destroy(mGIFStruct);
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mGIFStruct = nsnull;
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}
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}
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//******************************************************************************
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/** imgIDecoder methods **/
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//******************************************************************************
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//******************************************************************************
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/* void init (in imgILoad aLoad); */
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NS_IMETHODIMP nsGIFDecoder2::Init(imgILoad *aLoad)
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{
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mObserver = do_QueryInterface(aLoad);
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mImageContainer = do_CreateInstance("@mozilla.org/image/container;1?type=image/gif");
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aLoad->SetImage(mImageContainer);
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/* do gif init stuff */
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/* Always decode to 24 bit pixdepth */
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PRBool created = gif_create(&mGIFStruct);
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NS_ASSERTION(created, "gif_create failed");
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if (!created)
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return NS_ERROR_FAILURE;
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// Call GIF decoder init routine
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GIFInit(mGIFStruct, this);
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return NS_OK;
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}
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//******************************************************************************
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/** nsIOutputStream methods **/
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//******************************************************************************
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//******************************************************************************
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/* void close (); */
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NS_IMETHODIMP nsGIFDecoder2::Close()
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{
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if (mGIFStruct) {
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nsGIFDecoder2 *decoder = NS_STATIC_CAST(nsGIFDecoder2*, mGIFStruct->clientptr);
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if (decoder->mImageFrame)
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EndImageFrame(mGIFStruct->clientptr, mGIFStruct->images_decoded + 1,
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mGIFStruct->delay_time);
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if (decoder->mGIFOpen)
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EndGIF(mGIFStruct->clientptr, mGIFStruct->loop_count);
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gif_destroy(mGIFStruct);
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mGIFStruct = nsnull;
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}
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return NS_OK;
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}
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//******************************************************************************
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/* void flush (); */
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NS_IMETHODIMP nsGIFDecoder2::Flush()
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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//******************************************************************************
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/* static callback from nsIInputStream::ReadSegments */
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static NS_METHOD ReadDataOut(nsIInputStream* in,
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void* closure,
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const char* fromRawSegment,
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PRUint32 toOffset,
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PRUint32 count,
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PRUint32 *writeCount)
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{
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nsGIFDecoder2 *decoder = NS_STATIC_CAST(nsGIFDecoder2*, closure);
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nsresult rv = decoder->ProcessData((unsigned char*)fromRawSegment, count, writeCount);
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if (NS_FAILED(rv)) {
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*writeCount = 0;
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return rv;
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}
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return NS_OK;
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}
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// Push any new rows according to mCurrentPass/mLastFlushedPass and
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// mCurrentRow/mLastFlushedRow. Note: caller is responsible for
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// updating mlastFlushed{Row,Pass}.
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NS_METHOD
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nsGIFDecoder2::FlushImageData()
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{
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PRInt32 imgWidth;
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mImageContainer->GetWidth(&imgWidth);
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nsRect frameRect;
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mImageFrame->GetRect(frameRect);
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switch (mCurrentPass - mLastFlushedPass) {
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case 0: { // same pass
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PRInt32 remainingRows = mCurrentRow - mLastFlushedRow;
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if (remainingRows) {
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nsRect r(0, frameRect.y + mLastFlushedRow + 1,
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imgWidth, remainingRows);
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mObserver->OnDataAvailable(nsnull, mImageFrame, &r);
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}
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}
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break;
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case 1: { // one pass on - need to handle bottom & top rects
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nsRect r(0, frameRect.y, imgWidth, mCurrentRow + 1);
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mObserver->OnDataAvailable(nsnull, mImageFrame, &r);
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nsRect r2(0, frameRect.y + mLastFlushedRow + 1,
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imgWidth, frameRect.height - mLastFlushedRow - 1);
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mObserver->OnDataAvailable(nsnull, mImageFrame, &r2);
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}
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break;
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default: { // more than one pass on - push the whole frame
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nsRect r(0, frameRect.y, imgWidth, frameRect.height);
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mObserver->OnDataAvailable(nsnull, mImageFrame, &r);
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}
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}
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return NS_OK;
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}
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//******************************************************************************
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nsresult nsGIFDecoder2::ProcessData(unsigned char *data, PRUint32 count, PRUint32 *_retval)
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{
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// Push the data to the GIF decoder
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// First we ask if the gif decoder is ready for more data, and if so, push it.
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// In the new decoder, we should always be able to process more data since
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// we don't wait to decode each frame in an animation now.
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if (gif_write_ready(mGIFStruct)) {
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PRStatus result = gif_write(mGIFStruct, data, count);
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if (result != PR_SUCCESS)
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return NS_ERROR_FAILURE;
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}
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if (mImageFrame && mObserver) {
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FlushImageData();
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mLastFlushedRow = mCurrentRow;
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mLastFlushedPass = mCurrentPass;
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}
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*_retval = count;
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return NS_OK;
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}
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//******************************************************************************
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/* unsigned long writeFrom (in nsIInputStream inStr, in unsigned long count); */
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NS_IMETHODIMP nsGIFDecoder2::WriteFrom(nsIInputStream *inStr, PRUint32 count, PRUint32 *_retval)
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{
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return inStr->ReadSegments(ReadDataOut, this, count, _retval);
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}
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//******************************************************************************
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// GIF decoder callback methods. Part of pulic API for GIF2
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//******************************************************************************
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//******************************************************************************
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int nsGIFDecoder2::BeginGIF(
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void* aClientData,
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PRUint32 aLogicalScreenWidth,
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PRUint32 aLogicalScreenHeight,
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PRUint8 aBackgroundRGBIndex)
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{
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// If we have passed an illogical screen size, bail and hope that we'll get
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// set later by the first frame's local image header.
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if(aLogicalScreenWidth == 0 || aLogicalScreenHeight == 0)
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return 0;
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// copy GIF info into imagelib structs
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nsGIFDecoder2 *decoder = NS_STATIC_CAST(nsGIFDecoder2*, aClientData);
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decoder->mBackgroundRGBIndex = aBackgroundRGBIndex;
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if (decoder->mObserver)
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decoder->mObserver->OnStartDecode(nsnull);
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decoder->mImageContainer->Init(aLogicalScreenWidth, aLogicalScreenHeight, decoder->mObserver);
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if (decoder->mObserver)
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decoder->mObserver->OnStartContainer(nsnull, decoder->mImageContainer);
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decoder->mGIFOpen = PR_TRUE;
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return 0;
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}
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//******************************************************************************
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int nsGIFDecoder2::EndGIF(
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void* aClientData,
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int aAnimationLoopCount)
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{
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nsGIFDecoder2 *decoder = NS_STATIC_CAST(nsGIFDecoder2*, aClientData);
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if (decoder->mObserver) {
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decoder->mObserver->OnStopContainer(nsnull, decoder->mImageContainer);
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decoder->mObserver->OnStopDecode(nsnull, NS_OK, nsnull);
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}
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decoder->mImageContainer->SetLoopCount(aAnimationLoopCount);
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decoder->mImageContainer->DecodingComplete();
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decoder->mGIFOpen = PR_FALSE;
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return 0;
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}
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//******************************************************************************
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int nsGIFDecoder2::BeginImageFrame(
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void* aClientData,
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PRUint32 aFrameNumber, /* Frame number, 1-n */
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PRUint32 aFrameXOffset, /* X offset in logical screen */
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PRUint32 aFrameYOffset, /* Y offset in logical screen */
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PRUint32 aFrameWidth,
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PRUint32 aFrameHeight)
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{
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nsGIFDecoder2* decoder = NS_STATIC_CAST(nsGIFDecoder2*, aClientData);
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decoder->mImageFrame = nsnull; // clear out our current frame reference
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decoder->mGIFStruct->x_offset = aFrameXOffset;
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decoder->mGIFStruct->y_offset = aFrameYOffset;
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decoder->mGIFStruct->width = aFrameWidth;
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decoder->mGIFStruct->height = aFrameHeight;
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if (aFrameNumber == 1) {
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// Send a onetime OnDataAvailable (Display Refresh) for the first frame
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// if it has a y-axis offset. Otherwise, the area may never be refreshed
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// and the placeholder will remain on the screen. (Bug 37589)
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PRInt32 imgWidth;
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decoder->mImageContainer->GetWidth(&imgWidth);
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if (aFrameYOffset > 0) {
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nsRect r(0, 0, imgWidth, aFrameYOffset);
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decoder->mObserver->OnDataAvailable(nsnull, decoder->mImageFrame, &r);
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}
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}
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return 0;
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}
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//******************************************************************************
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int nsGIFDecoder2::EndImageFrame(
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void* aClientData,
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PRUint32 aFrameNumber,
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PRUint32 aDelayTimeout) /* Time this frame should be displayed before the next frame
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we can't have this in the image frame init because it doesn't
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show up in the GIF frame header, it shows up in a sub control
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block.*/
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{
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nsGIFDecoder2* decoder = NS_STATIC_CAST(nsGIFDecoder2*, aClientData);
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// If mImageFrame hasn't been initialized, call HaveDecodedRow to init it
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// One reason why it may not be initialized is because the frame
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// is out of the bounds of the image.
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if (!decoder->mImageFrame) {
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HaveDecodedRow(aClientData,nsnull,0,0,0);
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} else {
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// We actually have the timeout information before we get the lzw encoded
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// image data, at least according to the spec, but we delay in setting the
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// timeout for the image until here to help ensure that we have the whole
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// image frame decoded before we go off and try to display another frame.
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decoder->mImageFrame->SetTimeout(aDelayTimeout);
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}
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decoder->mImageContainer->EndFrameDecode(aFrameNumber, aDelayTimeout);
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if (decoder->mObserver && decoder->mImageFrame) {
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decoder->FlushImageData();
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if (aFrameNumber == 1) {
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// If the first frame is smaller in height than the entire image, send a
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// OnDataAvailable (Display Refresh) for the area it does not have data for.
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// This will clear the remaining bits of the placeholder. (Bug 37589)
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PRInt32 imgHeight;
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PRInt32 realFrameHeight = decoder->mGIFStruct->height + decoder->mGIFStruct->y_offset;
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decoder->mImageContainer->GetHeight(&imgHeight);
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if (imgHeight > realFrameHeight) {
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PRInt32 imgWidth;
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decoder->mImageContainer->GetWidth(&imgWidth);
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nsRect r(0, realFrameHeight, imgWidth, imgHeight - realFrameHeight);
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decoder->mObserver->OnDataAvailable(nsnull, decoder->mImageFrame, &r);
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}
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}
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decoder->mCurrentRow = decoder->mLastFlushedRow = -1;
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decoder->mCurrentPass = decoder->mLastFlushedPass = 0;
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decoder->mObserver->OnStopFrame(nsnull, decoder->mImageFrame);
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}
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decoder->mImageFrame = nsnull;
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PR_FREEIF(decoder->mGIFStruct->local_colormap);
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decoder->mGIFStruct->is_transparent = PR_FALSE;
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return 0;
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}
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//******************************************************************************
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// GIF decoder callback notification that it has decoded a row
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int nsGIFDecoder2::HaveDecodedRow(
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void* aClientData,
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PRUint8* aRowBufPtr, // Pointer to single scanline temporary buffer
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int aRowNumber, // Row number?
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int aDuplicateCount, // Number of times to duplicate the row?
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int aInterlacePass) // interlace pass (1-4)
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{
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nsGIFDecoder2* decoder = NS_STATIC_CAST(nsGIFDecoder2*, aClientData);
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PRUint32 bpr, abpr;
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// We have to delay allocation of the image frame until now because
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// we won't have control block info (transparency) until now. The conrol
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// block of a GIF stream shows up after the image header since transparency
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// is added in GIF89a and control blocks are how the extensions are done.
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// How annoying.
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if(! decoder->mImageFrame) {
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gfx_format format = gfxIFormats::RGB;
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if (decoder->mGIFStruct->is_transparent) {
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format = gfxIFormats::RGB_A1;
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}
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#if defined(XP_WIN) || defined(XP_OS2) || defined(XP_BEOS) || defined(MOZ_WIDGET_PHOTON)
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// XXX this works...
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format += 1; // RGB to BGR
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#endif
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// initalize the frame and append it to the container
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decoder->mImageFrame = do_CreateInstance("@mozilla.org/gfx/image/frame;2");
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if (!decoder->mImageFrame || NS_FAILED(decoder->mImageFrame->Init(
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decoder->mGIFStruct->x_offset, decoder->mGIFStruct->y_offset,
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decoder->mGIFStruct->width, decoder->mGIFStruct->height, format, 24))) {
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decoder->mImageFrame = 0;
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return 0;
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}
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decoder->mImageFrame->SetFrameDisposalMethod(decoder->mGIFStruct->disposal_method);
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decoder->mImageContainer->AppendFrame(decoder->mImageFrame);
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if (decoder->mObserver)
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decoder->mObserver->OnStartFrame(nsnull, decoder->mImageFrame);
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decoder->mImageFrame->GetImageBytesPerRow(&bpr);
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decoder->mImageFrame->GetAlphaBytesPerRow(&abpr);
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decoder->mRGBLine = (PRUint8 *)nsMemory::Realloc(decoder->mRGBLine, bpr);
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if (format == gfxIFormats::RGB_A1 || format == gfxIFormats::BGR_A1) {
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decoder->mAlphaLine = (PRUint8 *)nsMemory::Realloc(decoder->mAlphaLine, abpr);
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}
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} else {
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decoder->mImageFrame->GetImageBytesPerRow(&bpr);
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decoder->mImageFrame->GetAlphaBytesPerRow(&abpr);
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}
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if (aRowBufPtr) {
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nscoord width;
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decoder->mImageFrame->GetWidth(&width);
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gfx_format format;
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decoder->mImageFrame->GetFormat(&format);
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// XXX map the data into colors
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int cmapsize;
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PRUint8* cmap;
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cmapsize = decoder->mGIFStruct->global_colormap_size;
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cmap = decoder->mGIFStruct->global_colormap;
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if(decoder->mGIFStruct->global_colormap &&
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decoder->mGIFStruct->screen_bgcolor < cmapsize) {
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gfx_color bgColor = 0;
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PRUint32 bgIndex = decoder->mGIFStruct->screen_bgcolor * 3;
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bgColor |= cmap[bgIndex];
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bgColor |= cmap[bgIndex + 1] << 8;
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bgColor |= cmap[bgIndex + 2] << 16;
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decoder->mImageFrame->SetBackgroundColor(bgColor);
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}
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if(decoder->mGIFStruct->local_colormap) {
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cmapsize = decoder->mGIFStruct->local_colormap_size;
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cmap = decoder->mGIFStruct->local_colormap;
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}
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if (!cmap) { // cmap could have null value if the global color table flag is 0
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for (int i = 0; i < aDuplicateCount; ++i) {
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if (format == gfxIFormats::RGB_A1 ||
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format == gfxIFormats::BGR_A1) {
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decoder->mImageFrame->SetAlphaData(nsnull,
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abpr, (aRowNumber+i)*abpr);
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}
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decoder->mImageFrame->SetImageData(nsnull,
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bpr, (aRowNumber+i)*bpr);
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}
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} else {
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PRUint8* rgbRowIndex = decoder->mRGBLine;
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PRUint8* rowBufIndex = aRowBufPtr;
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switch (format) {
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case gfxIFormats::RGB:
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case gfxIFormats::BGR:
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{
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while (rowBufIndex != decoder->mGIFStruct->rowend) {
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PRUint32 colorIndex = (*rowBufIndex < cmapsize) ? (*rowBufIndex * 3) : 0;
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#if defined(XP_WIN) || defined(XP_OS2) || defined(XP_BEOS) || defined(MOZ_WIDGET_PHOTON)
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*rgbRowIndex++ = cmap[colorIndex + 2]; // blue
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*rgbRowIndex++ = cmap[colorIndex + 1]; // green
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*rgbRowIndex++ = cmap[colorIndex]; // red
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#else
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#if defined(XP_MAC) || defined(XP_MACOSX)
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*rgbRowIndex++ = 0; // Mac is always 32bits per pixel, this is pad
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#endif
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*rgbRowIndex++ = cmap[colorIndex]; // red
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*rgbRowIndex++ = cmap[colorIndex + 1]; // green
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*rgbRowIndex++ = cmap[colorIndex + 2]; // blue
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#endif
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++rowBufIndex;
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}
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for (int i=0; i<aDuplicateCount; i++) {
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decoder->mImageFrame->SetImageData(decoder->mRGBLine,
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bpr, (aRowNumber+i)*bpr);
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}
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break;
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}
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case gfxIFormats::RGB_A1:
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case gfxIFormats::BGR_A1:
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{
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memset(decoder->mRGBLine, 0, bpr);
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memset(decoder->mAlphaLine, 0, abpr);
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for (PRUint32 x = 0; x < (PRUint32)width; ++x) {
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if (*rowBufIndex != decoder->mGIFStruct->tpixel) {
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PRUint32 colorIndex = (*rowBufIndex < cmapsize) ? (*rowBufIndex * 3) : 0;
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#if defined(XP_WIN) || defined(XP_OS2) || defined(XP_BEOS) || defined(MOZ_WIDGET_PHOTON)
|
|
*rgbRowIndex++ = cmap[colorIndex + 2]; // blue
|
|
*rgbRowIndex++ = cmap[colorIndex + 1]; // green
|
|
*rgbRowIndex++ = cmap[colorIndex]; // red
|
|
#else
|
|
#if defined(XP_MAC) || defined(XP_MACOSX)
|
|
*rgbRowIndex++ = 0; // Mac is always 32bits per pixel, this is pad
|
|
#endif
|
|
*rgbRowIndex++ = cmap[colorIndex]; // red
|
|
*rgbRowIndex++ = cmap[colorIndex + 1]; // green
|
|
*rgbRowIndex++ = cmap[colorIndex + 2]; // blue
|
|
#endif
|
|
decoder->mAlphaLine[x>>3] |= 1<<(7-x&0x7);
|
|
} else {
|
|
#if defined(XP_MAC) || defined(XP_MACOSX)
|
|
rgbRowIndex+=4;
|
|
#else
|
|
rgbRowIndex+=3;
|
|
#endif
|
|
}
|
|
++rowBufIndex;
|
|
}
|
|
for (int i=0; i<aDuplicateCount; i++) {
|
|
decoder->mImageFrame->SetAlphaData(decoder->mAlphaLine,
|
|
abpr, (aRowNumber+i)*abpr);
|
|
decoder->mImageFrame->SetImageData(decoder->mRGBLine,
|
|
bpr, (aRowNumber+i)*bpr);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
decoder->mCurrentRow = aRowNumber + aDuplicateCount - 1;
|
|
decoder->mCurrentPass = aInterlacePass;
|
|
if (aInterlacePass == 1)
|
|
decoder->mLastFlushedPass = aInterlacePass; // interlaced starts at 1
|
|
}
|
|
|
|
return 0;
|
|
}
|